Adult male gorillas are known as silverbacks due to characteristic silver hair on their backs reaching to the hips. Occasionally, a silverback of over 1.8 metres (5 ft 11 in) and 230 kg (510 lb) has been recorded in the wild. Obese gorillas in captivity - like the ones seen here - can weigh as much as 270 kg (600 lb). Regardless - obese or not - I am terrified. How are we even related!?